# -*- test-case-name: twisted.test.test_formmethod -*-
# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.


"""
Form-based method objects.

This module contains support for descriptive method signatures that can be used
to format methods.
"""

import calendar

class FormException(Exception):
"""An error occurred calling the form method.
"""
def __init__(self, *args, **kwargs):
Exception.__init__(self, *args)
self.descriptions = kwargs


class InputError(FormException):
"""
An error occurred with some input.
"""


class Argument:
"""Base class for form arguments."""

# default value for argument, if no other default is given
defaultDefault = None

def __init__(self, name, default=None, shortDesc=None,
longDesc=None, hints=None, allowNone=1):
self.name = name
self.allowNone = allowNone
if default is None:
default = self.defaultDefault
self.default = default
self.shortDesc = shortDesc
self.longDesc = longDesc
if not hints:
hints = {}
self.hints = hints

def addHints(self, **kwargs):
self.hints.update(kwargs)

def getHint(self, name, default=None):
return self.hints.get(name, default)

def getShortDescription(self):
return self.shortDesc or self.name.capitalize()

def getLongDescription(self):
return self.longDesc or '' #self.shortDesc or "The %s." % self.name

def coerce(self, val):
"""Convert the value to the correct format."""
raise NotImplementedError("implement in subclass")


class String(Argument):
"""A single string.
"""
defaultDefault = ''
min = 0
max = None

def __init__(self, name, default=None, shortDesc=None,
longDesc=None, hints=None, allowNone=1, min=0, max=None):
Argument.__init__(self, name, default=default, shortDesc=shortDesc,
longDesc=longDesc, hints=hints, allowNone=allowNone)
self.min = min
self.max = max

def coerce(self, val):
s = str(val)
if len(s) < self.min:
raise InputError("Value must be at least %s characters long" % self.min)
if self.max != None and len(s) > self.max:
raise InputError("Value must be at most %s characters long" % self.max)
return str(val)


class Text(String):
"""A long string.
"""


class Password(String):
"""A string which should be obscured when input.
"""


class VerifiedPassword(String):
"""A string that should be obscured when input and needs verification."""

def coerce(self, vals):
if len(vals) != 2 or vals[0] != vals[1]:
raise InputError("Please enter the same password twice.")
s = str(vals[0])
if len(s) < self.min:
raise InputError("Value must be at least %s characters long" % self.min)
if self.max != None and len(s) > self.max:
raise InputError("Value must be at most %s characters long" % self.max)
return s


class Hidden(String):
"""A string which is not displayed.

The passed default is used as the value.
"""


class Integer(Argument):
"""A single integer.
"""
defaultDefault = None

def __init__(self, name, allowNone=1, default=None, shortDesc=None,
longDesc=None, hints=None):
#although Argument now has allowNone, that was recently added, and
#putting it at the end kept things which relied on argument order
#from breaking. However, allowNone originally was in here, so
#I have to keep the same order, to prevent breaking code that
#depends on argument order only
Argument.__init__(self, name, default, shortDesc, longDesc, hints,
allowNone)

def coerce(self, val):
if not val.strip() and self.allowNone:
return None
try:
return int(val)
except ValueError:
raise InputError("%s is not valid, please enter a whole number, e.g. 10" % val)


class IntegerRange(Integer):

def __init__(self, name, min, max, allowNone=1, default=None, shortDesc=None,
longDesc=None, hints=None):
self.min = min
self.max = max
Integer.__init__(self, name, allowNone=allowNone, default=default, shortDesc=shortDesc,
longDesc=longDesc, hints=hints)

def coerce(self, val):
result = Integer.coerce(self, val)
if self.allowNone and result == None:
return result
if result < self.min:
raise InputError("Value %s is too small, it should be at least %s" % (result, self.min))
if result > self.max:
raise InputError("Value %s is too large, it should be at most %s" % (result, self.max))
return result


class Float(Argument):

defaultDefault = None

def __init__(self, name, allowNone=1, default=None, shortDesc=None,
longDesc=None, hints=None):
#although Argument now has allowNone, that was recently added, and
#putting it at the end kept things which relied on argument order
#from breaking. However, allowNone originally was in here, so
#I have to keep the same order, to prevent breaking code that
#depends on argument order only
Argument.__init__(self, name, default, shortDesc, longDesc, hints,
allowNone)


def coerce(self, val):
if not val.strip() and self.allowNone:
return None
try:
return float(val)
except ValueError:
raise InputError("Invalid float: %s" % val)


class Choice(Argument):
"""
The result of a choice between enumerated types. The choices should
be a list of tuples of tag, value, and description. The tag will be
the value returned if the user hits "Submit", and the description
is the bale for the enumerated type. default is a list of all the
values (seconds element in choices). If no defaults are specified,
initially the first item will be selected. Only one item can (should)
be selected at once.
"""
def __init__(self, name, choices=[], default=[], shortDesc=None,
longDesc=None, hints=None, allowNone=1):
self.choices = choices
if choices and not default:
default.append(choices[0][1])
Argument.__init__(self, name, default, shortDesc, longDesc, hints, allowNone=allowNone)

def coerce(self, inIdent):
for ident, val, desc in self.choices:
if ident == inIdent:
return val
else:
raise InputError("Invalid Choice: %s" % inIdent)


class Flags(Argument):
"""
The result of a checkbox group or multi-menu. The flags should be a
list of tuples of tag, value, and description. The tag will be
the value returned if the user hits "Submit", and the description
is the bale for the enumerated type. default is a list of all the
values (second elements in flags). If no defaults are specified,
initially nothing will be selected. Several items may be selected at
once.
"""
def __init__(self, name, flags=(), default=(), shortDesc=None,
longDesc=None, hints=None, allowNone=1):
self.flags = flags
Argument.__init__(self, name, default, shortDesc, longDesc, hints, allowNone=allowNone)

def coerce(self, inFlagKeys):
if not inFlagKeys:
return []
outFlags = []
for inFlagKey in inFlagKeys:
for flagKey, flagVal, flagDesc in self.flags:
if inFlagKey == flagKey:
outFlags.append(flagVal)
break
else:
raise InputError("Invalid Flag: %s" % inFlagKey)
return outFlags


class CheckGroup(Flags):
pass


class RadioGroup(Choice):
pass


class Boolean(Argument):
def coerce(self, inVal):
if not inVal:
return 0
lInVal = str(inVal).lower()
if lInVal in ('no', 'n', 'f', 'false', '0'):
return 0
return 1

class File(Argument):
def __init__(self, name, allowNone=1, shortDesc=None, longDesc=None,
hints=None):
Argument.__init__(self, name, None, shortDesc, longDesc, hints,
allowNone=allowNone)

def coerce(self, file):
if not file and self.allowNone:
return None
elif file:
return file
else:
raise InputError("Invalid File")

def positiveInt(x):
x = int(x)
if x <= 0: raise ValueError
return x

class Date(Argument):
"""A date -- (year, month, day) tuple."""

defaultDefault = None

def __init__(self, name, allowNone=1, default=None, shortDesc=None,
longDesc=None, hints=None):
Argument.__init__(self, name, default, shortDesc, longDesc, hints)
self.allowNone = allowNone
if not allowNone:
self.defaultDefault = (1970, 1, 1)

def coerce(self, args):
"""Return tuple of ints (year, month, day)."""
if tuple(args) == ("", "", "") and self.allowNone:
return None

try:
year, month, day = map(positiveInt, args)
except ValueError:
raise InputError("Invalid date")
if (month, day) == (2, 29):
if not calendar.isleap(year):
raise InputError("%d was not a leap year" % year)
else:
return year, month, day
try:
mdays = calendar.mdays[month]
except IndexError:
raise InputError("Invalid date")
if day > mdays:
raise InputError("Invalid date")
return year, month, day


class Submit(Choice):
"""Submit button or a reasonable facsimile thereof."""

def __init__(self, name, choices=[("Submit", "submit", "Submit form")],
reset=0, shortDesc=None, longDesc=None, allowNone=0, hints=None):
Choice.__init__(self, name, choices=choices, shortDesc=shortDesc,
longDesc=longDesc, hints=hints)
self.allowNone = allowNone
self.reset = reset

def coerce(self, value):
if self.allowNone and not value:
return None
else:
return Choice.coerce(self, value)


class PresentationHint:
"""
A hint to a particular system.
"""


class MethodSignature:

def __init__(self, *sigList):
"""
"""
self.methodSignature = sigList

def getArgument(self, name):
for a in self.methodSignature:
if a.name == name:
return a

def method(self, callable, takesRequest=False):
return FormMethod(self, callable, takesRequest)


class FormMethod:
"""A callable object with a signature."""

def __init__(self, signature, callable, takesRequest=False):
self.signature = signature
self.callable = callable
self.takesRequest = takesRequest

def getArgs(self):
return tuple(self.signature.methodSignature)

def call(self,*args,**kw):
return self.callable(*args,**kw)